10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better
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1 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Allan S. Jaffe, MD.* Consultant - Cardiology & Laboratory Medicine Professor of Medicine Chair, CCLS Division, Department of Laboratory Medicine and Pathology Mayo Clinic and Medical School Rochester, Minnesota *Dr. Jaffe is or has been a consultant to most of the major diagnostic companies as well as Amgen. CP
2 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity CP
3 Cardiac Troponin Assay Score Card Acceptance Designation Total Precision at 99 th Percentile Guideline Acceptable < 10% Clinically Usable >10 to < 20% Not Acceptable > 20% Assay Designation Level 4 3rd gen hs Level 3 2nd gen hs Level 2 1st gen hs Level 1 Contemporary Measurable Normal Values below 99 th percentile > 95% 75 to < 95% 50 to < 75% < 50% gen = generation; hs = high sensitivity Apple 2009 Clin Chem 2009 CP
4 Point of Care Assays Contemporary Assays High Sensitive Assays Comparison of Normals Detected With Various Assays Singulex hstnl ARCHITECT hstnl Siemens hstnl Beckman Access hstnl Roche hstnt Beckman Tnl Siemens Tnl Ultra (Centaur) Siemens Tnl (Immulite) AxSYM Tnl ARCHITECT Tnl OCD Tnl Siemens Tnl (Dimension) Roche Tnl Siemens Tnl (Vista) IL ctnl Abbott ISTAT Siemens Stratus Alere BioMerleux Detected (%) Apple et al: Clin Chem 58(11):56, 2012 CP
5 Abbott ARCHITECT i2000 SR hs-ctnl Beckman Access 2 hs-ctnl Siemens Dimension Vista hs-ctnl Singulex Erenna hs-ctnl Roche Cobas e601 hs-ctnl Abbott ARCHITECT i2000 SR ctnl Abbott AxSYM Troponin-ADV Abbott POC i-stat 3000 ctnl Alere Triage ctnl Cardio3 Beckman Access 2 mod sens ctnl biomeriéux VIDAS ctnl-ultra OCD VITROS ECi ctnl ES Roche Cobas e601 ctnl Siemens Centaur Tnl Ultra Siemens Dimension ExL 200 TNI Siemens Dimension Vista ctnl Siemens Immulite 2000 XPi ctnl Siemens Stratus CS ctnl Troponin 99 th percentile (ng/l) Measureable (%) 99 th Percentile Values and Percent of Patients Detected by Various Cardiac Troponin Assays Apple, CLINCHEM/2012/ CP
6 CP
7 Area under the ROC curve Accuracy by Time of Admission th % value NEJM 361:858, 2009 Mostly same assays but < 99 th % value cut off used Abbott-architect troponin I Roche high-sensitive troponin T Roche troponin I Siemens troponin I ultra Standard assay All patients Hours since onset of symptoms CP
8 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre - analytical and analytical confounds CP
9 Effects of Hemolysis on hsctnt Values 180 ctni (ortho) Troponin change (%) ctnt ,000 1,200 1,400 1,600 1,800 Bais: Clin Chem, 2010 (in press) Hemolysis index CP
10 Frequency Frequency Frequency Reference Range for ctn Assays (hsctnt Roche) 300 Claimed reference limit (14.0) 160 Claimed reference limit (14.0) 100 Claimed reference limit (40.0) % reference limit (29.9) % reference limit (20.0) % reference limit (14.4) hs-ctnt hs-ctnt hs-ctnt [pg/ml (ng/l)] [pg/ml (ng/l)] [pg/ml (ng/l)] No screening Questionaire only Questionaire + egfr, Collinson et al: Clinical Chemistry 58:1, (2012) NTproBNP, BP and EF >50 CP
11 Abbott ARCHITECT i2000 SR hs-ctnl Beckman Access 2 hs-ctnl Siemens Dimension Vista hs-ctnl Singulex Erenna hs-ctnl Roche Cobas e601 hs-ctnl Abbott ARCHITECT i2000 SR ctnl Abbott AxSYM Troponin-ADV Abbott POC i-stat 3000 ctnl Alere Triage ctnl Cardio3 Beckman Access 2 mod sens ctnl biomeriéux VIDAS ctnl-ultra OCD VITROS ECi ctnl ES Roche Cobas e601 ctnl Siemens Centaur Tnl Ultra Siemens Dimension ExL 200 TNI Siemens Dimension Vista ctnl Siemens Immulite 2000 XPi ctnl Siemens Stratus CS ctnl Troponin 99 th percentile (ng/l) Measureable (%) 99 th Percentile Values and Percent of Patients Detected by Various Cardiac Troponin Assays Apple, CLINCHEM/2012/ CP
12 CP
13 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values CP
14 DEMOGRAPHIC CHARACTERISTICS, CARDIOVASCULAR RISK FACTORS, AND CARDIAC PHENOTYPES ACROSS INCREASING CATEGORIES OF CARDIAC TROPONIN T LEVEL ctnt 0.01 ng/ml with standard assay, No/total (%). ctnt Category, ng/ml a. < < P for Variable (n = 2589) (n = 278) (n = 279) (n = 278) (n = 122) Trend 0/2589 0/278 0/279 1/277 (0.4) 40/120 (33.3) <.001 Age, median (QR), y 41 (35-49) 47 (39-55) 49 (41-55) 52 (45-58) 53 (44-68) <.001 Men, No./total, (%) 895/2589 (34.6) 175/278 (62.9) 196/279 (70.3) 214/278 (77.0) 85/122 (69.7) <.001 Race/ethnicity, No./total (%) Black 1229/2589 (47.5) 150/278 (54.0) 173/279 (62.0) 182/278 (65.5) 94/122 (77.0) <.001 White 794/2589 (30.7) 88/278 (31.7) 78/279 (28.0) 61/278 (21.9) 21/122 (17.2) <.001 Hispanic 500/2589 (19.3) 37/278 (13.3) 27/279 ( 9.7) 30/278 (10.8) 7/122 ( 5.7) <.001 Other 66/2589 (2.5) 3/278 (13.7) 1/279 (0.4) 5/278 (1.8) 0/ CP
15 99 th Percentile Values in Normal Subjects Measured By Contemporary, Sensitive and High-Sensitivity Cardiac Troponin Assays High Sensitivity Abbott ARCHITECT Beckman Access Siemens Dimension Vista Singulex Erenna 99 th Percentile Percent Measurable Male 99 th Percentile Female 99 th Percentile LoD ng/l >LoD ng/l ng/l ng/l Roche ctnt Apple et al: CLINCHEM/2012/ CP
16 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences CP
17 Low-End Comparability.01 ng/ml.03 ng/m Difference with TnThs (%) 53 pg/ml 30 pg/ml Troponin T, Elecsys 4 th gen (pg/ml) CP
18 TACTICS (TIMI 18) Subgroups Cardiac troponin T Conservative Invasive No. treatment treatment Primary endpoint <0.1 ng/ml < < Favors invasive treatment Favors Conservative treatment Death or MI <0.1 ng/ml < < JAMA 286:2405, Odds ratio CP CP
19 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences Recognize there will be more elevations CP
20 Prevalence of Detectable ctnt & levels > 99 th Percentile URL. ctnt Level, ng/ml Sample Sample Sample Weight-Adjusted Weight-Adjusted Size, Prevalence, % Prevalence, Group No. No. (%) (95% Cl) No. (%) 95% Cl) Overall population (27.0) 25.0 ( ) Restricted population Without CHD (26.0) 24.2 ( ) Without cardiovascular disease (24.8) 23.7 ( ) Without cardiovascular disease or CKD a Without cardiovascular disease, CKD, subclinical heart disease, diabetes, or hypertension b (24.0) 23.1 ( ) (20.0) 19.3 ( ) 122 (3.4) 103 (3.0) 2.0 ( ) 1.8 ( ) 82 (2.5) 1.9 ( ) 65 (2.3) 1.2 ( ) 43 (1.7) 1.1 ( ) CP
21 CV death or HF (%) Risk of CV Death or Heart Failure by hsctni (Abbott) in PEACE P<0.001 Quartile Years Omland et al: JACC, 2013 CP
22 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences Recognize there will be more elevations Recognize that more patients will be diagnosed with AMI CP
23 Percent with Positive ctni Result (%) Detection of ctni in Patients with Unstable Angina Current Generation ctni (ng/ml) Nano-cTnI (ng/ml) => % 98% 98% % Not Done 12% 24% hours 2 hours 8 hours 24 hours Not Done Wilson and Morrow, AHJ September 2009 CP
24 Differences with hs-ctni in Patients Presenting Early with Chest Discomfort Change criteria Myocardial injury present a Myocardial injury absent a Earliest pair (median interval 1 h; IQR 1-3 h)b hs-ctni change positive ng/l ( ) ng/l ( ) hs-ctni change negative ng/l ( ) ng/l ( ) AccuTnI change positive g/l g/l ( ) AccuTnI change negative g/l g/l ( ) Any specimen pair (median 4 specimens/subject; IQR 2-6) c hs-ctni change positive ng/l ( ) ng/l ( ) hs-ctni change negative ng/l ( ) AccuTnI change positive g/l ( ) g/l ( ) AccuTnI change negative g/l g/l ( ) a Peak AccuTnI concentration was used to define if myocardial injury was present (>99 th percentile) or absent ( 99 th percentile) b Data are n median ctni concentration at presentation (IQR) c Data are n median ctni concentration at peak (IQR) Kavsak et al: Clin Chem 55:573, 2009 CP
25 Survival by hsctni Values - Preface P<0.01 <5.0 ng/l ng/l >40.0 ng/l ng/l ,095 1,460 1,825 2,190 2,555 2,920 3,285 3,650 Kavsak, Clin Chem, 2009 Days to death CP
26 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences Recognize there will be more elevations Recognize that more patients will be diagnosed with AMI Recognize that the time to ruling in, despite the hype may not be shortened CP
27 Area under the ROC curve Accuracy by Time of Admission th % value NEJM 361:858, 2009 Mostly same assays but < 99 th % value cut off used Abbott-architect troponin I Roche high-sensitive troponin T Roche troponin I Siemens troponin I ultra Standard assay All patients Hours since onset of symptoms CP
28 Time to Diagnosis with hsctnt Based on The Gold Standard Minutes % CV 99th % hsctnt TUSCA CP
29 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences Recognize there will be more elevations Recognize that more patients will be diagnosed with AMI Recognize that the time to rule in will be shortened for many but, despite the hype may not be shortened overall New strategies will reduce the time to rule out AMI in many patients. CP
30 DIAGNOSTIC PERFORMANCE OF THREE MODELS INCORPORATING hstnt AND ECG FINDINGS FOR EARLY EXCLUSION OF AMI Model Sensitivity Specificity PPV NPV (95% Cl) (95% Cl) (95%Cl) (95% Cl) A ( ) 30.1 ( ) 23.7 ( ) ( ) B 95.2 ( ) 69.4 ( ) 40.4 ( ) 98.5 ( ) C ( ) 66.4 ( ) 30.3 ( ) ( ) Model A: hstnt <3 ng/l and no ECG ischaemia; Model B: hstnt <14 ng/l and no ECG ischaemia; Model C: (hstnt <3 ng/l and no ECG ischaemia) OR (hstnt <14 ng/l and no ECG ischaemia and symptom onset <6h) Reference: Body CP
31 Accelerated Diagnostic Protocols with hsctni (Abbott) 30 Day MACE Rates ADAPT APACE Eligible patients with informed consent N = 1976 ) Eligible patients with informed consent N = 1616 Excluded N = 231 TIMI - score incomplete No - serial stored bloods Excluded: Chest pain of unknown origin and/or hsctni above cut off N = 46 No serial samples N = 655 No ECG available N = 6 Index test = ADP N = 1695 Index test ADP N = 909 ADP positive not low risk N = 957 ADP negative low risk N ( = 678 ADP positive not low risk N = 558 ADP negative low risk N = 351 MACE N = 245 No MACE N = 721 MACE N = 2 No MACE N = 676 MACE N = 155 No MACE N = 403 MACE N = 1 No MACE N = 350 Submitted Cullen, Than et al CP
32 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences Recognize there will be more elevations Recognize that more patients will be diagnosed with AMI Recognize that the time to rule in will be shortened for many but, despite the hype may not be shortened overall New strategies will reduce the time to rule out AMI in many patients Use changing values to diagnose AMI CP
33 Criteria for Acute Myocardial Infarction Detection of a rise and/or fall of cardiac biomarker values (preferably cardiac troponin (ctn) ) with at least one value above the 99 th percentile upper reference limit (URL) and with at least one of the following: Ischaemic symptoms ECG changes of new ischaemia (new ST-T changes or new LBBB) Development of pathologic Q waves in the ECG Imaging evidence of new loss of viable myocardium or new regional wall motion abnormality Identification of an intracoronary thrombus by angiography or autopsy CP
34 Changes in ctnt in Dialysis Patients with ACS ctnt (µmol/l) Nephron Clin Prac 98:c87, 2004 Days CP CP
35 Determining Assay Values are Different CP
36 Short-Term Analytical and Biological Variation by hs-ctnl Assays Abbott a Beckman a Roche (E170) b Siemens a Singulex c CV-A (%) d CV-I (%) CV-G (%) NA Index of individuality NA RCV (%) e NA NA 47.0 NA NA RCV increase (%) f NA RCV decrease (%) f NA Within-individual mean (ng/l) NA a Apple et al (38); b Vasile et al (36); c Wu et al (35) d CV-A, analytical CV; CV-I, within-individual CV; CV-G, between individual CV; NA, not available; RCV, relative change value; e REC percentage applies to parametric data f RCV increase and decrease percentages refer to nonparametric data and are log-transformed Apple et al: Clin Chem 58:1, 2012 CP
37 PERCENTILES OF CHANGE IN ctnt CONCENTRATION IN CORONARY CARE UNIT PATIENTS WITHOUT MI. Relative change, %.. Absolute change, ng/l. Diagnosis 50 th (95% Cl) 97.5 th (95% Cl) 50 th (95% Cl) 97.5 th (95% Cl) n a All diagnoses 10 (10-11) 59 (48-71) 1.6 ( ) 14.1 ( ) 866 Heart failure 10 ( 9-12) 51 (38-65) 3.1 ( ) 30 ( ) 204 Stable angina pectoris 10 ( 9-1 2) 67 (34-99) 1.4 ( ) 13.6 ( ) 343 Atrial fibrillation 9 ( 6-12) 66 (29-104) 1.1 ( ) 9.1 ( ) 86 Noncardiac chest pain 12 (10-15) 64 (46-82) 1.2 (1-1.5) 7.5 ( ) 229 a Number of ctnt measurements included in calculations. b NA, not applicable, because the absolute change in ctnt concentration differed among diagnosis groups (heart failure vs atrial fibrillation, stable angina pectoris, and noncardiac chest pain, all P <0.02, and atrial fibrillation vs stable angina pectoris, P = 0.017, for difference in medians. Reference Clin Chem 2012;58(3) CP
38 Use of High Sensitivity Troponin T to Diagnose Myocardial Infarction Clinical setting consistent with myocardial ischemia Baseline <14 ng/l ng/l 53 ng/l Retest hstnt 3 hours after symptom onset or if timing of symptom onset is unclear at 6 hours after presentation Change <50% ng/l 53 ng/l Change 50% Change <20% Change 20% 14 ng/l rules out MI with >90% probability If 14 ng/l then proceed to middle part of algorithm Adverse prognosis Retest hstnt at 6, 12 hr White HD; AHJ 2010 Myocardial infarction Evidence-based treatments CP
39 Absolute and Relative Changes in Patients with AMI, Unstable Angina and Non-Cardiac Chest Pain Non-STEMI UAP Non-ACS Non-STEMI UAP Non-ACS Absolute change (log) Relative change (log) Mueller et al: Clinical Chemistry 58:1 (2011) CP
40 Sensitivity Specificity Defining the Optimal Delta: The Tension Between Sensitivity and Specificity Sensitivity Specificity Relative change in hstni concentration Data from Keller et al (JAMA 2012) CP
41 Mean increase in hsctnt (ng/l) Delta for the Diagnosis of AMI with hsctnt Based on The Gold Standard (T0-T3hr) % CV 99th % hsctnt TUSCA, AJM in press CP
42 MUST USE FIXED TIMING Near 99 th % URL value Delta Guidance The greater the change, the more likely AMI The lesser the change, the less likely AMI Percentages and absolute values may provide similar information At higher levels Absolute values may be better CP
43 Delta Guidance MUST USE FIXED TIMING Near 99 th % URL value At higher levels Avoid The greater the change, the more likely AMI The lesser the change, the less likely AMI Percentages and absolute values may provide similar information Absolute values may be better Extrapolating the data from one assay to another assay The idea that release is continuous so that one can use a one or 2 hour delta by dividing by the delta found at 5 or 6 hours. CP
44 10 Ways to Make the Use of High Sensitivity Cardiac Troponin Values Easier and Better Use the proper definition for high sensitivity Be aware that hs assays will be more sensitive to pre -analytical and analytical confounds Use whole numbers and gender specific cut off values Use anchor values from previous assays to gauge differences Recognize there will be more elevations Recognize that more patients will be diagnosed with AMI Recognize that the time to rule in will be shortened for many but, despite the hype may not be shortened overall New strategies will reduce the time to rule out AMI in many patients Use changing values to diagnose AMI Remember it is the clinician who makes the diagnosis of AMI and not the laboratory results CP
45 It is not the Data but How You Intepret it that is Important CP
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